Seems a regional thing, but in Canada it's normal at most grocery stores to require a $1 coin (sometimes only a quarter) to use a cart, you get the money back when you return the cart. It reduces the number of shopping carts left scattered all over the parking lot, which the paint on my car is appreciative of.
I'll freely admit that I could cut down some of what I carry, but I think the Tesla is a bit too minimal with it's storage too. There needs to be a compromise. Arm rest storage and door pockets should be more than adequate. (well, and maybe coat hooks)